), the U.S. military had become complacent and predictable with regard to asymmetric attacks by state and non-state actors employing terrorist and guerilla methodologies.As a result, during what were ostensibly peacekeeping operations by a U.S. Marine Corps landing force ashore in Lebanon in 1983, it allowed two civilian trucks to breach the perimeter of the Marines' containment area and detonate their load of explosives as suicide vehicles adjacent to the Marines' billeting areas.